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I've only seen 'rumours' that it might -
but nothing on website to specify :/

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also ... found this info about usb 3 devices...

it also states near the bottom, that usb 3 devices use thicker cables ...
wonder if iPhone 6's lightening cable is any thicker ? hmm

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http://support.apple.com/kb/ht5172
 
People on here claim that the flash storage inside the iPhone is the bottleneck, so that's why they only support USB 2.
 
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